Modular laundry dryer burner assembly

ABSTRACT

A laundry dryer burner assembly having a burner chamber, a burner, and a rotatable assembly. The burner chamber extends along a longitudinal direction, and the burner is located within the burner chamber and extends along the longitudinal direction. The burner is rotationally fixed relative to the burner chamber. The rotatable assembly is connected to the burner and selectively movable about the longitudinal direction between a first position and a second position. The rotatable assembly has a mixing tube having a mixing tube outlet rotatably connected to the burner and a mixing tube inlet that is offset in a radial direction that is perpendicular to the longitudinal direction from the mixing tube outlet.

TECHNICAL FIELD

This invention is related to laundry drying machine burners and burnerassemblies.

BACKGROUND

Typical laundry dryers are constructed to maximize the laundry loadcapacity by making the rotating dryer drum as large as possible. Thesize of the drum is limited by the size of the dryer cabinet, and thesize of the cabinet is typically dictated by factors related tocommercial expectations, such as the need to fit the dryer into atypical household laundry room or the like. The drive to increase drumsize, while not exceeding the desired cabinet size, leads to a reductionin useable free space for internal components that surround the drum,such as the gas burner assembly.

It has been found that it is difficult to accommodate dryer burnerswithout adapting the burner to the particular internal layout of thedryer. Any significant deviation among products can lead to the need fora customized burner assembly to fit the particular drum and cabinetconfiguration. For example, a freestanding dryer can have asignificantly different internal space than a so-called laundry centerhaving a dryer mounted above a washer. Similarly, a combinedwasher/dryer that uses a single drum to perform washing and drying, canhave a significantly different internal layout than a freestanding dryeror a laundry center.

Previous efforts to provide burner assemblies for different types ofdryer have led to excess costs to make unique designs for each internallayout. Thus, the inventor has determined that the state of the art ofdryer burners can still be advanced.

This description of the background is provided to assist with anunderstanding of the following explanations of exemplary embodiments,and is not an admission that any or all of this background informationis necessarily prior art.

SUMMARY

In a first aspect, there is provided A laundry dryer burner assemblyhaving: a burner chamber extending along a longitudinal direction; aburner located within the burner chamber and extending along thelongitudinal direction, the burner being rotationally fixed relative tothe burner chamber; and a rotatable assembly connected to the burner andselectively movable about the longitudinal direction between a firstposition and a second position, the rotatable assembly comprising amixing tube having a mixing tube outlet rotatably connected to theburner and a mixing tube inlet that is offset in a radial direction thatis perpendicular to the longitudinal direction from the mixing tubeoutlet.

In some examples, the mixing tube inlet is located, relative to theradial direction, outside an outer perimeter of the burner chamber.

In some examples, the rotatable assembly further comprises a venturi,the venturi having a venturi outlet connected to the mixing tube inlet,a venturi tube gas inlet, and one or more venturi tube air inlets.

In some examples, the rotatable assembly further comprises a gas valveconnected to the venturi tube gas inlet.

In some examples, the mixing tube is bent 180° between the mixing tubeinlet and the mixing tube outlet, and at least one of the venturi andthe gas valve is at least partially located adjacent an outer wall ofthe burner chamber, and between an inlet end and an outlet end of theburner chamber with respect to the longitudinal direction.

In some examples, the mixing tube is bent 180° between the mixing tubeinlet and the mixing tube outlet.

In some examples, the first position is at least 90° about thelongitudinal direction from the second position.

In some examples, the burner comprises a plurality of first flame portsextending along the longitudinal direction on a first lateral side ofthe burner, and a plurality of second flame ports extending along thelongitudinal direction on a second lateral side of the burner, with thefirst plurality of flame ports and the second plurality of flame portsbeing at an equal vertical height when the burner is installed in alaundry dryer.

In some examples, the rotatable assembly further comprising an igniterpositioned adjacent the burner.

In some examples, the burner comprises one or more first flame ports ata first angular position relative to the longitudinal direction, and oneor more second flame ports at a second angular position relative to thelongitudinal direction, and the igniter is positioned adjacent at leastone of the one or more first flame ports when the rotatable assembly isin the first position, and adjacent at least one of the one or moresecond flame ports when the rotatable assembly is in the secondposition.

In some examples, the rotatable assembly further comprises a flamesensor that is positioned adjacent at least one of the one or more firstflame ports when the rotatable assembly is in the first position, andadjacent at least one of the one or more second flame ports when therotatable assembly is in the second position

In some examples, a connector joins the burner to the burner chamber.

In some examples, the connector is rigidly connected to one of theburner and the burner chamber, and slidingly engaged along thelongitudinal direction with the other of the burner and the burnerchamber.

In some examples, the connector extends radially between a longitudinalend of the burner opposite the mixing tube and an inner wall of theburner chamber.

In some examples, one of the mixing tube outlet and the burner comprisesa radial flange, and the other of the mixing tube outlet and the burnercomprises a radial groove, the radial flange being captured in theradial groove to allow relative rotation between the burner and themixing tube outlet about the longitudinal direction.

In another exemplary aspect, there is provided a method for installing alaundry dryer burner assembly, the method comprising: providing a dryercabinet assembly with a burner chamber in a fixed position within thecabinet assembly; providing a laundry dryer burner assembly having aburner and a rotatable assembly comprising a mixing tube rotatablyconnected to the burner; rotating the burner relative to the rotatableassembly to orient the burner with a first row of flame ports on a firstlateral side of the burner at an equal vertical height with a second rowof flame ports on a second lateral side of the burner; inserting theburner into the burner chamber; rotationally fixing the burner to theburner chamber; and connecting the rotatable assembly to a gas supplyline.

In some examples, the step of rotating the burner relative to therotatable assembly is performed before the step of inserting the burnerinto the burner chamber.

In some examples, the step of rotating the burner relative to therotatable assembly is performed after the step of rotationally fixingthe burner to the burner chamber.

In some examples, the method includes rotationally fixing the rotatableassembly relative to the burner after the step of rotating the burnerrelative to the rotatable assembly.

In some examples, rotationally fixing the rotatable assembly comprisessecuring the rotatable assembly to the gas supply line.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of inventions will now be described, strictly by way ofexample, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic side elevation view of a first exemplary burnerassembly.

FIG. 2 is a schematic side elevation view of a second exemplaryrotatable assembly.

FIGS. 3A and 3B illustrate the burner assembly of FIG. 1 in twodifferent installations.

FIG. 4 illustrates another exemplary burner assembly without the burnerchamber.

FIG. 5 illustrates an exemplary connector for joining a burner to thewall of a burner chamber.

FIG. 6 shows a cutaway view of the connector of FIG. 5 .

FIG. 7 illustrates an exemplary mixing tube and rotatable connector.

FIGS. 8A and 8B show the burner assembly of FIG. 4 in two differentorientations relative to the burner chamber and burner.

In the drawings, like numbers refer to like elements.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

The inventor has determined that requirements to provide gas burners tomultiple different dryer product configurations can be satisfied byproviding a gas burner assembly having a burner and burner chamber thatare fixed in the same orientation in all dryer configurations, and arotatable assembly that can be reoriented to accommodate differences inthe surrounding cabinet layout. While embodiments are expected to haveparticular utility for using a single burner assembly in multipledifferent products, embodiments also provide flexibility to accommodateindividual product lines, and provide advantages in the product assemblyprocess. Thus, there is no need to use embodiments in conjunction withmultiple different dryer products.

FIG. 1 schematically illustrates an exemplary embodiment of a laundrydryer burner assembly 100. The burner assembly 100 has a burner chamber102 and a burner 104 located within the burner chamber 102. The burnerchamber 102 and burner 104 extend along a longitudinal direction L froma chamber inlet 106 to a chamber outlet 108.

The burner chamber 102 is defined by one or more walls, which may have acircular cross-section or other cross-sectional shapes as viewed alongthe longitudinal direction L. As shown in the subsequent embodiments,the wall may have various openings to allow airflow or for otherreasons. The chamber 102 may conveniently be formed by sheet metal, suchas a rolled steel sheet that is bonded or crimped to form a closed seam,such as known in the art.

The burner 104 is positioned within the burner chamber 102 andconfigured to generate a flame pattern that is configured to heat airpassing from the chamber inlet 106 to the chamber outlet 108. A varietyof different burners 104, and associated flame patterns, are known inthe art. In the shown example, the burner 104 comprises a tubular burnerhaving a first row of flame ports 110 extending along the longitudinaldirection L on a first lateral side of the burner 104, and a second rowof flame ports 110 extending along the longitudinal direction L theopposite lateral side of the burner 104. The term “lateral side” refersto sides in a horizontal plane when the burner 104 is installed for use.When so installed, the burner 104 is oriented with the first row offlame ports 110 at the same vertical height as the second row of flameports 110, preferably with mirror symmetry with respect to a planedefined by the longitudinal direction L and the global (gravitational)vertical direction V.

The burner 104 may be positioned at any suitable location with respectto the burner chamber 102. In the shown example, the burner 104 islocated entirely within the confines of the burner chamber 102, and at alocation below a vertical center of the burner chamber 102. Thisconfiguration is expected to provide a relatively large space within theburner chamber 102 above the burner 104, where heat can be exchangedbetween the burner flames and the passing air. Other configurations maybe used in other embodiments.

When fully installed, the burner 104 may be rotationally fixed relativeto the burner chamber 102. Rotational fixation between the burner 104and the burner chamber 102 is desirable when the burner 104 isconfigured to operate in a particular orientation with respect to thevertical direction V. For example, in the shown embodiment, the burner104 is intended to operate with the two rows of flame ports 110 facingin opposite lateral directions to evenly heat the air passing throughthe burner chamber 102. Rotational fixation may be provided by one ormore connectors 112 that extend from the burner 104 to the wall of theburner chamber 102. The connectors 112 may have permanent attachments,such as rivets, welds, or crimped joints. The connectors 112alternatively may be detachable, such as discussed in more detailherein. The connectors 112 hold the burner 104 relative to the burnerchamber 102 to prevent relative rotation between them about thelongitudinal direction L, which prevents the burner 104 from beingimproperly installed or positioned relative to the burner chamber 102,and ensures proper orientation of the flame ports 110.

While it is preferred for there to be a connector 112 joining the burner104 to the burner chamber 102, in some cases the connector 112 may beomitted while still providing relative rotational fixation. For example,the burner 104 may be connected to the rotatable assembly 114 discussedbelow by a collar that rotationally fixes the rotatable assembly 114 tothe burner 104 once the burner 104 and rotatable assembly 114 are movedto their desired final relative angular positions, or a rotation lockmay be installed to secure the positions of the parts.

The burner assembly 100 also includes a rotatable assembly 114 having amixing tube 116. The mixing tube outlet 118 is connected to the burner104 by a joint that allows the mixing tube 116 (and the remainder of therotatably assembly 114) to rotate relative to the burner 104 about thelongitudinal direction L. The mixing tube 116 extends from a mixing tubeinlet 120 to the mixing tube outlet 118. The mixing tube inlet 120 isoffset in a radial direction R from the mixing tube outlet 118. Theradial direction R is any direction that is perpendicular to thelongitudinal direction L. In FIG. 1 , the radial direction isillustrated by an arrow pointing down along the vertical direction V,but the radial direction may be oriented laterally or at any otherangle.

The mixing tube inlet 120 may be positioned outside an outer perimeterof the burner chamber 102, such as shown, but this is not strictlyrequired. For example, the mixing tube inlet could be positioned at thelocation identified by line 122. The mixing tube inlet 120 may belocated, with respect to the longitudinal direction L, between thechamber inlet 106 and the chamber outlet 108, such as shown.Alternatively, the mixing tube inlet 120 may be located outside thelongitudinal extend of the burner chamber 102, such as shown at thealternative location identified by line 122.

The mixing tube 116 is a rigid conduit having a closed passage forming afluid communication path from the mixing tube inlet 120 to the mixingtube outlet 116. Gas and air are blended within the mixing tube 116 andconveyed to the burner 104 at the mixing tube outlet 116. The mixingtube inlet 120 may be connected to one or more flexible conduits thatprovides the gas and air, but more preferably it is connected to aventuri 124.

The venturi 124 comprises a rigid passage having a gas inlet 126 and oneor more air inlets 128. The air inlets 128 and gas inlet 126 areupstream of a constriction, which causes incoming pressurized gas toaccelerate and reduce pressure and thereby entrain air into the gasstream. Venturis are well known in the art and need not be described inmore detail herein.

The venturi 124 may be connected at its upstream end to a flexibleconduit that provides a flow Office Action gas, but more preferably agas valve 130 is rigidly attached to the venturi 124. In this case, thegas valve 130 is also part of the rotating assembly 114. Gas valves areknown in the art and need not be described in more detail herein. Thegas valve 130 is connected to a flexible conduit 132 that provides gasto the rotatable assembly 114.

The burner assembly 110 also may include other features, such as anigniter 134 (e.g., a resistance heated coil or spark generator, as knownin the art) and a flame sensor 136 (e.g., a conductive rod though whicha current indicating the presence of a flame is detected, or the like asknown in the art). In the embodiment of Figure, the igniter 134 andflame sensor 136 are mounted to the wall of the burner chamber 102, butone or both may be mounted directly to the burner 102. Other locationsfor the igniter 134 and flame sensor 136 are discussed below.

The rotatable assembly 114 of the embodiment of FIG. 1 is configuredwith the mixing tube 116 being bent such that the mixing tube inlet 120faces 180° relative to the mixing tube outlet 118. The mixing tube 116is also dimensioned such that the venturi 124 and gas valve 130 arelocated outside and adjacent to the burner chamber 102. This provides acompact arrangement of parts relative to both the radial direction R andthe longitudinal direction L.

While the configuration of FIG. 1 is expected to be particularly useful,it is not strictly required. For example, the rotatable assembly 114 maybe configured with the mixing tube inlet 120 oriented at 90° to themixing tube outlet 118, and with the venturi 124 or other partsextending along the radial direction R, such as shown in FIG. 2 . Otheralternatives and variations will be apparent to persons of ordinaryskill in the art in view of the present disclosure.

FIGS. 3A and 3B illustrate two different laundry drying machines withthe burner assembly 100 two different orientations. FIG. 3A shows thedrum 300 and cabinet 302 of a typical standalone laundry dryer. Thecabinet 302 encloses various parts, such as a blower 304 for directingthe drying air through the burner assembly 100 and drum 300. Here, theburner assembly 100 is configured with the rotatable assembly 114pointing downward relative to the burner chamber 102 to fit within theallowed space.

In FIG. 3A, the drying machine is a laundry center type machine, and thecabinet 302 is relatively narrow, leaving insufficient room to installthe burner assembly 100 in the configuration shown in FIG. 3A. Thus, therotatable assembly 114 is repositioned by rotating it about thelongitudinal axis to be offset radially to the right, such that theburner assembly 100 fits within the allowed space.

The angular range of motion θ of the rotatable assembly 114 relative tothe burner chamber 102 and burner tube 104 may be selected according toany criteria. Preferably, the angular range of motion θ is selected toallow installation of the burner assembly 100 into at least twodifferent drying machines having different configurations of internalparts. Alternatively, or in addition, the angular range of motion θ maybe selected to allow the rotatable assembly 114 to be moved intoposition where it can be installed in the burner chamber 102. Forexample, the rotatable assembly 114 may be placed in one orientation toslide the burner 104 into the burner chamber 102, and then rotated tofit the rotatable assembly 114 into the desired location within thecabinet 302. In various embodiments, the angular range of motion θ maybe at least 45°, at least 90°, or at least 120°. Other alternatives andvariations will be apparent to persons of ordinary skill in the art inview of the present disclosure.

FIGS. 4 through 8B illustrate another exemplary embodiment of a burnerassembly 100. In this case, the burner assembly comprises a burnerhousing 102, a burner 104, and a rotatable assembly 114, generally asdescribed previously herein, so differences will be highlighted in thefollowing description. As before, the burner 104 includes two lateralrows of flame ports 110, and also may include one or more additionalflame ports or rows of flame ports, such as a circumferential row offlame ports 400 that are useful to convey the flame from one lateral rowto the other. The burner 104 may be formed, for example, as a metalcasting, tube, or sheet. In this example, the burner 104 is a metal tubehaving the flame ports 110, 400 drilled, or otherwise formed into it,and the end of the tube may be closed and folded to form a connector 112to join the burner 104 to the burner chamber 102.

Referring to FIGS. 5 and 6 , the connector 112 is configured hold theburner 104 relative to the burner chamber 102 to prevent relativerotation between these parts. Specifically, the connector 112 has alongitudinally extending foot 500 that engages a tab 502 that extendsinwardly from the wall of the burner chamber 102. The foot 500 has anotch 600 that is sized to receive the tab 502 to prevent the foot 500,and thus the connector 112 and the burner 104, from rotating relative tothe burner chamber 102. This configuration is expected to be beneficialto allow the burner 104 to be assembled into the burner chamber 102 bysliding the burner along the longitudinal direction until the tab 502 iscaptured in the notch 504, at which point the rotatable assembly 114 canbe rotated to the desired final angular orientation while the burner 104remains rotationally fixed to the burner chamber 102.

Other embodiments may use different connectors 112 (e.g., a connector112 formed by a separate part that is attached to the burner 104), orthe connector may be omitted. Other alternatives and variations will beapparent to persons of ordinary skill in the art in view of the presentdisclosure.

FIG. 7 shows an example of the mixing tube 116 construction. The mixingtube 116 is formed by two shells 700, each of which has an embossedregion formed to shape one side of the mixing tube 116. The shells 700are secured together such that the embossed regions form the mixing tube116 therebetween. The shells 700 may comprise, for example, stampedmetal sheets that are joined by welds, crimps, or the like. The shell700 also may be configured with matching embossed regions to form theventuri 124, and may have cutouts to form the air inlets 128.

FIG. 7 also shows an example of a rotatable joint connecting the mixingtube outlet 118 to the burner 104. The rotatable joint is formed by aradial groove 702 in the rotatable assembly 114, and a radial flange onthe burner 104. The radial flange 704 extends outward from the burner104 and fits inside the radial groove 702. The radial groove 702 allowsthe radial flange 704, and thus the burner 104, to rotate about thelongitudinal direction L, but prevents other relative motion. The fitbetween the radial flange 704 and radial groove 702 also may be selectedto inhibit gas from exiting or entering at the rotatable joint. Theradial groove 702 and radial flange 704 can be conveniently formed byswaging or stamping the parts forming the burner 104 and mixing tube116. Other embodiments may use other rotatable connections between theburner 104 and the mixing tube 116, such as concentric tubes that may besecured to each other in different angular orientations with a clamp orscrew, and so on. Other alternatives and variations will be apparent topersons of ordinary skill in the art in view of the present disclosure.

One or both of the shells 700 also may be configured to form otherparts, such as a mounting flange 706 for holding the igniter 134 and/orflame sensor 136. For example, in the embodiment of FIGS. 4 through 8B,both the igniter 134 and the flame sensor 136 are mounted to the flange706 to thereby be part of the rotatable assembly 114. Where the igniter134 and flame sensor 136 are part of the rotating assembly 114, theypreferably are configured to be operative at two or more angularorientations of the rotatable assembly 114 relative to the burner 104.For example, FIG. 8B shows the rotatable assembly 114 at a first angularorientation relative to the burner 104, and FIG. 8B shows the rotatableassembly 114 at a second angular orientation relative to the burner 104.In each of the positions shown in FIGS. 8A and 8B, the igniter 134 andflame sensor 136 are positioned adjacent one of the two rows of flameports 110. Specifically, in FIG. 8A, they are adjacent a first row offlame ports 110 a on one side of the burner 104, and in FIG. 8B they areadjacent a second row of flame ports 110 b (see FIG. 7 ) on the otherlateral side of the burner 104. Thus, the igniter 134 and flame detector136 are equally effective in either of the two positions.

The igniter 134 and flame detector 136 also may be effective throughoutthe angular range of motion θ of the rotatable assembly 114. Forexample, as noted above, a circumferential row of flame ports 400 mayextend around the burner 104, such that the igniter 134 and flamedetector 136 are always adjacent one or more flame ports. Otheralternatives and variations will be apparent to persons of ordinaryskill in the art in view of the present disclosure, and it will beunderstood that other embodiments may have only one of the igniter 134or flame detector 136 mounted as part of the rotatable assembly 114.

A burner assembly 100 according to these or other embodiments may beinstalled in various ways. In one example, the burner assembly 100 isassembled by installing the burner chamber 102 in the dryer cabinet 302,and then installing the combined burner 104 and rotatable assembly 114in the cabinet 302 with the burner 104 inside the burner chamber 104.Installing the burner chamber 102 separately in this manner may behelpful to secure the burner chamber 102 to other parts of the airflowpath within the dryer. During installation, the burner 104 may berotated (in unison with or separately from the rotatable assembly 114)to orient the burner ports 110 at the desired orientation within theburner chamber 102 (e.g., rows on opposite lateral sides at an equalvertical height, as discussed above). Once the burner 104 is secured atthe proper angular orientation relative to the burner chamber 102, therotatable assembly 114 may be rotated to fit it into the desired spacewithin the cabinet 302. Alternatively, the rotatable assembly 114 may berotated to its final orientation relative to the burner 104 before theburner 104 is affixed to the burner chamber.

The rotatable assembly 114 may be rotationally fixed in its finalposition in various ways. For example, where the rotating joint requiressignificant force to cause relative rotation, the joint itself may haveenough friction to prevent the rotatable assembly 114 from moving awayfrom its desired final orientation. As another example, a fastener maybe used to fix the rotatable assembly 114 to the burner chamber 102 orcabinet 302. As another example, the rotatable assembly 114 may besecured in place by attaching a rigid or rigidly mounted gas supply line132 to the gas valve 130, such that the supply line 132 holds therotatable assembly 114 in the desired orientation. Other alternativesand variations will be apparent to persons of ordinary skill in the artin view of the present disclosure.

The present disclosure describes a number of inventive features and/orcombinations of features that may be used alone or in combination witheach other or in combination with other technologies. The embodimentsdescribed herein are all exemplary, and are not intended to limit thescope of the claims. It will also be appreciated that the inventionsdescribed herein can be modified and adapted in various ways, and allsuch modifications and adaptations are intended to be included in thescope of this disclosure and the appended claims.

1. A laundry dryer burner assembly comprising: a burner chamberextending along a longitudinal direction; a burner located within theburner chamber and extending along the longitudinal direction, theburner being rotationally fixed relative to the burner chamber; and arotatable assembly connected to the burner and selectively movable aboutthe longitudinal direction between a first position and a secondposition, the rotatable assembly comprising a mixing tube having amixing tube outlet rotatably connected to the burner and a mixing tubeinlet that is offset in a radial direction that is perpendicular to thelongitudinal direction from the mixing tube outlet.
 2. The laundry dryerburner assembly of claim 1, wherein the mixing tube inlet is located,relative to the radial direction, outside an outer perimeter of theburner chamber.
 3. The laundry dryer burner assembly of claim 1, whereinthe rotatable assembly further comprises a venturi, the venturi having aventuri outlet connected to the mixing tube inlet, a venturi tube gasinlet, and one or more venturi tube air inlets.
 4. The laundry dryerburner assembly of claim 3, wherein the rotatable assembly furthercomprises a gas valve connected to the venturi tube gas inlet.
 5. Thelaundry dryer burner assembly of claim 4, wherein the mixing tube isbent 180° between the mixing tube inlet and the mixing tube outlet, andat least one of the venturi and the gas valve is at least partiallylocated adjacent an outer wall of the burner chamber, and between aninlet end and an outlet end of the burner chamber with respect to thelongitudinal direction.
 6. The laundry dryer burner assembly of claim 1,wherein the mixing tube is bent 180° between the mixing tube inlet andthe mixing tube outlet.
 7. The laundry dryer burner assembly of claim 1,wherein the first position is at least 90° about the longitudinaldirection from the second position.
 8. The laundry dryer burner assemblyof claim 1, wherein the burner comprises a plurality of first flameports extending along the longitudinal direction on a first lateral sideof the burner, and a plurality of second flame ports extending along thelongitudinal direction on a second lateral side of the burner, with thefirst plurality of flame ports and the second plurality of flame portsbeing at an equal vertical height when the burner is installed in alaundry dryer.
 9. The laundry dryer burner assembly of claim 1, whereinthe rotatable assembly further comprising an igniter positioned adjacentthe burner.
 10. The laundry dryer burner assembly of claim 9, whereinthe burner comprises one or more first flame ports at a first angularposition relative to the longitudinal direction, and one or more secondflame ports at a second angular position relative to the longitudinaldirection, and the igniter is positioned adjacent at least one of theone or more first flame ports when the rotatable assembly is in thefirst position, and adjacent at least one of the one or more secondflame ports when the rotatable assembly is in the second position. 11.The laundry dryer burner assembly of claim 10, wherein the rotatableassembly further comprises a flame sensor that is positioned adjacent atleast one of the one or more first flame ports when the rotatableassembly is in the first position, and adjacent at least one of the oneor more second flame ports when the rotatable assembly is in the secondposition
 12. The laundry dryer burner assembly of claim 1, furthercomprising a connector joining the burner to the burner chamber.
 13. Thelaundry dryer burner assembly of claim 12, wherein the connector isrigidly connected to one of the burner and the burner chamber, andslidingly engaged along the longitudinal direction with the other of theburner and the burner chamber.
 14. The laundry dryer burner assembly ofclaim 13, wherein the connector extends radially between a longitudinalend of the burner opposite the mixing tube and an inner wall of theburner chamber.
 15. The laundry dryer burner assembly of claim 1,wherein one of the mixing tube outlet and the burner comprises a radialflange, and the other of the mixing tube outlet and the burner comprisesa radial groove, the radial flange being captured in the radial grooveto allow relative rotation between the burner and the mixing tube outletabout the longitudinal direction.
 16. A method for installing a laundrydryer burner assembly, the method comprising: providing a dryer cabinetassembly with a burner chamber in a fixed position within the cabinetassembly; providing a laundry dryer burner assembly having a burner anda rotatable assembly comprising a mixing tube rotatably connected to theburner; rotating the burner relative to the rotatable assembly to orientthe burner with a first row of flame ports on a first lateral side ofthe burner at an equal vertical height with a second row of flame portson a second lateral side of the burner; inserting the burner into theburner chamber; rotationally fixing the burner to the burner chamber;and connecting the rotatable assembly to a gas supply line.
 17. Themethod of claim 16, wherein the step of rotating the burner relative tothe rotatable assembly is performed before the step of inserting theburner into the burner chamber.
 18. The method of claim 16, wherein thestep of rotating the burner relative to the rotatable assembly isperformed after the step of rotationally fixing the burner to the burnerchamber.
 19. The method of claim 16, further comprising rotationallyfixing the rotatable assembly relative to the burner after the step ofrotating the burner relative to the rotatable assembly.
 20. The methodof claim 19, wherein rotationally fixing the rotatable assemblycomprises securing the rotatable assembly to the gas supply line.